Earlier quoted context omitted.
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Oh dear. BoE in their blog have a different idea to you, from their official blog: http://bankunderground.co.uk/2015/06/30/banks-are-not-interm... > In the simple ILF model, bank loans represent the intermediation of real savings, or loanable funds, between non-bank savers and non-bank borrowers. Lending starts with banks collecting deposits of real resources from one agent, and ends with the lending of those resourc…
Base money (dollar bills, Euro notes, pound notes etc.) is controlled entirely by the central bank and base money can be created and destroyed by the central bank, whenever they like. Think of it as like digging some more gold or creating some more bitcoins.
Bank money is created by people either depositing base money with a bank, or indeed by a bank issuing a loan as described in the blog post. A deposit can be seen as a loan to the bank: all deposits are loans, all loans are deposits when looked at from the other PoV. Anyway, bank money has similar characteristics to base money - it can be used by purchase goods, it stores value etc.
I can buy a book with base money, by handing the merchant a few dollar bills. Or I can buy the book with bank money, by handing my bank card to the merchant and after some settlement magic my bank will stop owing me some money and will instead owe it to the merchant. The IOU is the bank money, it is a claim on base money that was previously deposited. Base money and bank money act similarly from my PoV, they are both denominated in dollars (or Euros or pounds or...) and they are normally interchangeable at a 1:1 rate. Sometimes they are not.. e.g. if my bank was nearly going bankrupt with no deposit insurance, I might be happy to get my base money back at 80 cents on the dollar from my bank money. Bank money has credit risk of the bank, base money has no counterparty risk.
Banks do need to have reserves of base money relative to the amount of bank money they are allowed to create; this is called Capital Adequacy and is a primary restraint on bank money creation. A bank has a limited amount of capital (its own real base money that is not owed to anyone else) and it cannot easily create more capital. If a bank is lending out too much to borrowers, then its Capital Adequacy Ratio will get out of line and it will have to stop lending.